After three years of use my TM66 monitor would not hold a change. Sent an email to Support at Tire Minder they said sorry the battery is not replaceable. I would have to purchase a refurbished or new monitor.
I did some research and found this replacement battery on eBay P/N 111861099475
The back of the monitor is easy to pry off then I cut the wires on the old battery and soldered in the new one with heat shrink over the connections.
Hope this information will help someone else save time and money.
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